How do I convert M4A to AIFF?

Add your M4A file to the upload area above, then press Convert. The AIFF file downloads straight to your device. You do not need an account, and there is no watermark.

Are my files uploaded to a server?

No. This conversion runs entirely inside your browser using WebAssembly, so the file never leaves your device — you can even disconnect from the internet after the page loads and it will still work.

Does converting to AIFF reduce quality?

No. AIFF is a lossless format, so the conversion preserves exactly what is in your M4A file. Note that it cannot recover detail that was already discarded when the M4A was first created — a lossless container does not undo earlier compression.

How large a file can I convert?

Up to 300 MB per file for this conversion. Because the work happens in your browser, the practical limit is your device's memory — larger files work on a desktop with plenty of RAM and may fail on an older phone.

Can I convert several files at once?

Yes. Add as many as you like and press Convert All. Each file is processed independently, so one failure does not stop the rest, and you can download everything together as a ZIP.

Can I use this on my phone?

Yes. FileTools360 works in mobile browsers on iOS and Android, including choosing files straight from your camera roll. Very large videos may run out of memory on a phone — those are better converted on a laptop.

AudioLosslessRuns in your browser

M4A to AIFF Converter

Turn M4A files into AIFF in a couple of clicks. MP4 container holding AAC or ALAC audio. Apple's uncompressed audio counterpart to WAV. The conversion is lossless — every pixel, sample or byte in the source is preserved.

On your deviceNever uploadedGone when you close the tabHow this works

Drop your files here

M4A files (.m4a, .m4b) · up to 300 MB each

or paste files from your clipboard

Ready when you are

Drop a M4A file above and FileTools360 will turn it into AIFF — right here on your device, without uploading anything.

⌘K to search converters

How to use it

1
Add your M4A files
Drag them onto the upload area, choose them from your device, or paste them from your clipboard. You can queue several at once.
2
Adjust the settings if you want to
The defaults suit most people. Open Advanced to control bitrate, sample rate and channels and start and end times.
3
Convert and download
Press Convert. Everything happens on your own device — nothing is uploaded. Download files one by one, or grab them all as a ZIP.

M4A and AIFF explained

M4A is an MP4 container holding only audio — usually AAC, sometimes Apple Lossless. The extension exists mainly so players know not to look for a video track.

AIFF is Apple's uncompressed audio format, functionally equivalent to WAV but with better metadata support and big-endian byte order.

Where M4A files come from: iTunes purchases, Apple Music downloads, voice memos and audiobooks.
Where AIFF is used: Mac audio production and older Apple software.

M4A vs AIFF

The two formats solve different problems, which is why converting between them involves trade-offs rather than a straight upgrade.

M4A compared with AIFF
Property	Source	Target
Compression	Lossy or lossless	Uncompressed
Introduced	2001	1988
Browser support	Very good, especially on Apple platforms.	Strong on Apple, decent elsewhere.

M4A is stronger at: Excellent quality per byte. Proper chapter support, which is why audiobooks use it. Strong metadata and artwork handling.
AIFF is stronger at: Uncompressed and lossless. Better metadata handling than WAV. Standard in Mac audio workflows.

Why convert M4A to AIFF?

People make this switch when they run into the limits of M4A: you need certainty that any device will play it. AIFF is the better fit when audio production on a Mac.

Be aware of the size trade-off: AIFF is uncompressed, so expect the converted file to be considerably larger than the M4A you started with.

M4A limitations that prompt the switch: Less universal than MP3 on older or cheaper hardware. The extension hides what codec is actually inside.
What you give up: Very large files. Less universally supported than WAV.

Does converting M4A to AIFF reduce quality?

Both formats store the content without discarding data, so this conversion preserves it exactly. The file size may change because the two formats compress differently, but the content itself is unaffected.